Inverted hypodermic syringe



2 Sheets-Sheet G. N. HEIN IN\`/`ERTED HYPODERMIC SYRINGE Filed March 191926 WWW/mf! 7g aum" May 22, 192s.

G.- N. HEIN INVERTED JIYPODERMIC SYRINGE "mum @gli

a@ /Mw @b4/ATV i Patented May 22, l928.l

GEORG-E N. HEIN, O F SAN FRANCISCO, CALIFORNIA.

yINvERTiain HYronnnMic sYnINen.

Application filed` March 19, 1926. SeraliNo. 96,014.

The invention relates to an inverted hypo? derniic syringe.

The oblgect ot theinvention is to improve the construction yof inverted'hypoderinic syringes and to provide a simple, practical.

and efficient inverted hypoderinic syringe of strong durable andcomparatively inexpensive construction in which the piston and thebarrel inay have either a ground glass, metallic oi' aiielastic packingfit.V

A further object of the invention is to provide anv inverted hypoderniicsyringe having a tubular or hollow piston and proa relatively shortpistonhead to be provided s with either a ground glass lit oran elast-icpacking lit.

Another object of the invention jis to equip invertedhypoderniicsyringes of the larger type with means for slidinglyy guidingand steading the inner end of the barrel to enable a short piston headto be employed.

With these and other objects in view the invention consists in theconstruction and novel combination and arrangement of parts hereinafterfully described, villustrated in the accompanying dra-wings and pointedout in the claims hereto appended, it. being understood that variouschanges in the forni, proportion and minor details of' construction maybe resorted to without departing from the spirit or sacrificing Vany ofthe advantages of theinvention.

ln the drawings Fig. l is a vertical sectional` view of an invertedhypodermic syringe constructed in accordance with this invention. t v

Fig. 2'is a horizontal sectional. view of the same.

Fig. 3 is a longitudinal sectional viewo an inverted hypoderniic syringeillustrating another form of the invention' in which the piston iscomposed of a plurality of sections.

Fig. 4f is an enlarged detailed sectional` view illustrating anotherform of joint.v and packing forA the sections of the piston.

Fig. a isa longitudinalsectional view i1- lustrating another form of theinvention in which the piston is composed of sectionsl for the largertype of syringes.

Fig,` y6 is a detailed sectional view illustrating an elastic packing'for pistonsy of large hypodermic syringes.

Fig. 7 is a longitudinal sectional view of an inverted liypodermicsyringe of thelarger type equipped with slidable barrel guidingv means.y v

`Fig.- 8 is a` horizontal sectional view through the holder or griptaken substantially on the line 8 8 of Figure 7.

Fig. 9 is a detail sectionalview; illustrat i i ing another forni of-st`em.

Fig. l0 is a detail'view illustrating the construction of .theresilient' fingers shown in Fig. 7. I

Fig'. l1 is a detail. viewof` the barrel of Fig. li shown in positionfor `receiving a medicament. l

Referring particularly to Figures andl 2 o t the drawings7 the invertedhypodermic syringe which is designed for the smaller type of syringessubjected to excessive pressure comprises in its construction anietallic holder l, av hollow tubular piston 2` and a barrel `3. Theholder which may be varied in construction and ywhich maybe made of Yany suitable material is 'composed of spaced i sides and connectinguppery andlower portions, the spacesv between the sides of the holderexposing the hollow piston and the barrel which are preferablyconstructedr ot' glass but which may be made 'ofi metal or glass. Theupper andlower portions 3 and 4 are circular and the lower portion whichis preferably thickened as shown forms a seat for the tubular piston andis provided lwith interior screw threads 5 .to be engaged by a threadedportionl Got the tubular piston whereby the piston isniounted upon theholder between the sides thereof in fixed relation to thesame.- Theholder is provided tat yits upper end with vlaterally pro- Ijectinggrips 7 which are preferably curved Dfi as shownto fitfthe fingers ofthe operator.

' The hollow tubular piston is reduced at thel lower end to 4forni thethreaded portion or Vshank` and it 'is provided also at the lower endwitha reduced projecting nipple j 8f adapted. 'to receive a hypodermicvneedle and preferably provided; with a tapered coiled spring 9forpositivelyV holding theiieedle in place on the nipple. In; `practicethe ica needle will be interlocked with the nipple and the latter ispreferably provided with an annular rib or enlargement for engaging theupper coils of Athe spring. The piston which is designed in this form ofthe invention to have a ground glass or similar lit within the barrel iscomposed of an outer shell and an inner tube 11 which provides a bore orpassage for the liquidcontained within the barrel. The barrel 3 ispreferably provided with an enlarged upper end or head 12 presenting aflat upper face and adapted to serve as a base for supporting the barrelin an upright position to serve as a container for the liquid to beinjected into the patient by the 'hypedermic syringe.y The ground glassbarrel is telescopically placed over the *hollow tubular piston providedwith hollow tub'ular'piston and is introduced between the same and theholder and thebarrel will be guided and a liquid and airtight oint isprovided. In the form of the invention a perfect inverted hypodermicsyringe is provided `without the use of an elastic gasket. The groundglass lit extends the entire length of the barrel and a similar smoothfit is provided when the barrel and the hollow tubular piston areconstructed of metal.

In order to prevent the barrel from accidently dropping olf the pistonin the han-` dling of the hypodermic syringe the latter is equipped witha frictiondevice consisting of a curved plate or member 13 arrangedexteriorly of the holder at the upper end thereof and provided withr aprotuberance 14 preferably formed byindenting the material of the plate13 or bending a portion of the same at righthangles and extendingthrough an opening 15 in the` holder and presenting a curved surface toand frictionally engaging the barrel as clearly illustrated. in Figure2k of the drawings. The curved plate 13 conforms to the configuration ofthe holder and is connected with the terminals of a coiled spring 1Gencircling the holder as'shown and yieldably maintaining the projection14 in engagement with the barrel. The plate 13 is provided withperforations `leand the ends of the coiled spring are secured in thesaid perforations.

In Figure Soif the drawings is illustrated an inverted hypodermicsyringe having a a ground glass fit and composed of an upper vsection 18and a lower section 19. The piston shown in Figure 3 .is arranged withina metallic holder 2O constructed the same as that heretofore describedbut the holder may of course be made of any suitable material. The lowersection of the piston is preferably constructed of metal and consists ofa reduced stem portion provided at its lower end with a head 21 threadedto screw into the socket or opening 22 in the lower connecting portionof the holder 20. The said section 19 is provided with a nipple exten-18 which is tubular and hollow is constructed i of glass and consists ofan outer shell and v an inner tube 29 forming a passage for the liquidcontents of the barrel 30 sliding telescopically over the upper sectionof the piston. The lower endof the upper section of the piston isprovided with tapered extension or nipple 31which lits within a taperedextension 32 of the socket 27. The tapered extension of the socketpresents inclined walls to the inclined surface of the nipple 31 and anair and liquid tight connection is provided. instead of providing thetapered extension or nipple and the tapered portion of thev socket asubstantially cylindrical nipple 33 may bevemployed as illustrat-ed inFigure 4 of the drawings.' Nipple 33 which is provided with annular ribreceives an elastic packing 35 which engages a smooth cylindricalportion 3G of the socket 37 of the lower section 38 ofthe piston shownin'Figure 4. The rib 33 causes an vannular projection or rib to beformedexteriorly of the elastic packing for engaging the smooth portion 36 ofthe socket 37. An an' and liquid tight connection is thus providedbetween the substance ofthe piston. A form of the piston shown inFigures 3 and 4 is for the purpose of reducing the area or length of theground. glass tit or compacting surface of the piston@ This will enablea relatively long piston and barrel to bey einployed withv only arelatively short ground glass surface on the piston.r The saineconstruction. may of course be employed-when` the parts are made ofmetal and the contacting surface ofthepiston may be made relativelyshort in the same manner.

In Figure 5 of the drawing is illustrated a sectional pistonforhypodermic syringes of the larger sizes composed of a lower section3S) andan upper section 40. The upper section is preferably constructedof glass and the lower section 89 may ybe made of either glass or metal.The uppei'section telescopically receives a barrel 41 and a relativelyshort ground `glass surface is provided on the upper section of thepiston to effect a liquid and air tight connection betweenthe piston andthe barrel. The lower end, of the upper section is reduced to providel athreaded shank 42 which is'received within an'interiorly threaded socket43 of the lower section 3Q-and the latter is provided with an upwardlyextending stem 44 formed integral with the lower section and receivedvwithin .a longitudinal opening 45, y l y, l

yto accommodate barrels ot difierent'diain-y p in the upper section.VThe. stem and the lower section are providedwith a bore 46- t-forin aVpassage orthe.`liquid` or other contents of the barrel 4l and the upperend ot'v the stem may be tapered as shown at 47 to fit a vtaperedportion 48 of the .opening 45. rl`his will provide ati'ght tit but atight fit may be eliected bymeans of engaging the upper end of the stemwith an inclined surface 49 as illustrated in Figure 9 of the drawings.ln this ligure the stein 50 is provided with a reduced upper end and theopening in the upper vsection l of the piston Ais provided with aconical portionlwhich is engaged by the upper edge of the stem lowersections 55 and 56 adapted to be con-l 50. Also as illustrated in Figure6. the drawings the upper section may be reduced as showneat 52 andprovided with an annular rib 53 which is adapted to produce an annularenlargement eXteriorly of an elastic gasket y54. The enlarged ordistendedA portion of the gasket projects slightly beyond the side faceof the piston for Contact with the barrel of the syringe. 1 v

InFigures 7 and 8 of the drawings is illustrated-a syringe of the largertype comprising a piston composed of upper and structed` of either glassor. metal and preferably secured together by a threaded connection. Athreaded connection as shown in this `figure*.consistsgof a reducedthreaded shanlr 57 which `screws into an interiorly threaded socket 58.The shank is preferably formed on the lower end of the upper section ofthe pistonl and the socket is provided in the upper end of the lowersection which has an integral upwardly extending stem 59 arranged in alongitudinal opening 6() in the upper section of the piston. The uppersection is shown provided with an elastic gasket 6l arranged on areduced lupper portion 62 of the'upper section 55 of the piston andhaving a projecting annular portion 63 formed by an annular rib 64 ofthe reduced upper end portion 62 of the piston. The elastic gasket mayof course be omitted if desired anda ground glass fit may be employedinstead of the gasket. The inner or lowerend of the barrel is guided bya slidable guiding device comprising a hub 65 having an opening toreceive the lower section of the piston and pro'- vided with a flange 66upon which kis lmounted a'v plurality ol resilient barrel engagingmembers `67 preferably consisting vof approximately U-shaped lingerscurved longitudinally aty their upper portion to provide a flaringentrance to the guide. The lingers 67 may be constructed of any suitableresilient material and their outer. or lower terminal portions aresecured to the periphery of the flange 66 preferably in suitablerecesses thereof as shown. The i removed and aheador section of adiilerent diameter may be appliedto the lower section to litthe'desiredxbarrel. .By this operation a variety.- of v different sizesof barrels" and .p istons may be employed and in the operav tion ot thehypoderrnic syringe theguidewill lmaintain the lower-end' of thebarrelin proper positionr with lrelationto the piston.

yllhe piston .isniounted in -a-suitable `holderl' .which in theforni ot'the invention lshown in Figure 7 consists of a vhub 68 interiorlyvthreaded zit-'69 to receive the lowerl threaded til) end portion 70 ofthe lowersection ,56.1 1; Ther 'holder is' provided with lateralextensions 7lk which. are prelerably-fconcave at the -side faces .tofacilitate gripping and holding the piston.` Any-other suitableormofgriporli; d

lioldermay beemployed and thef pistonis provided at its lower end with anipple 72 and witlra needle holdingspring 7 3. The

bore 740i the lower section. forms, aA passage for the liquid or othercontents of the barrel and the upper end of the extension 59 formsatight connection with the upper section of'k the piston preferably by,being tapered as vshown but any otherforrn o/joint orl conneet-ionv mayofcourse jbe; employed.

lVhat is [claiinedis: y f o l. An inverted hypodermic springeconiprising a piston having anfenlargedfupper portion or head providedwith a packing at one` endand having` a guiding portion eX-tendingbeyond the packing and a reduced lower portionfor stein, kabarrel ltelescopica-lly nia vfitted over the enlarged upper portion ofthe piston and guidedr by the same and a guide`A slidably mounted on thereduced llower portion of the piston and receiving and guiding the lowerend of the barrel.

2. An inverted hypoderniic syringe-coini prising a piston having a`longitudinal bore or passage and vcomposed of an enlarged upperiportionor head and a lower" portion or rod, a barrel open at the lower endtelescopicallyfitted over the enlarged upper portionr orhead land guidedby the sameand a guide slidably fitted on and movable along the,

same.

3. An inverted hypodermic syringe comy lower portion orrod of the pistonand pror y prising a hollow tubular pistonhaving anl f upper enlargedportion or head and a lower' f vportion or rod, a barrel slidablyfitting the upper portionorhead of the piston and a guidev slidablymounted on the lower portion or rod of the piston and consisting of ahub vit'orming a seat for the'lower end of thebarrel and resilientlingers carried by the hub and yieldingly` engaging the barrel, i

4. An inverted hypodermic syringe comprising a hollow tubular pistoncomposed of upper and lower sections( provided with ineane foroetaohably Connecting thein together the upper Section forming a head 'vhavingn vpacking portion and an extended guiding portion and a lowersection being of leesdiaineter and constitutingv a 'piston rod, a steinextending 'from the lower section laeyond the connecting meanesubstantially through the upper Section ami providedr withinezine torcontacting.' therewith to forni a" tightjjoint and the barrelteleeeopieally itted over and guided by theupp'er section.

5. 'An inverted hypoderniie Syringe Conif o, holloiiv tubular pietonhaving :in

.enlarged upporportion or head and alre- 'dueed lower portion or roddetaohably oon- :neeted together, the upper section having` e,

packing `portion und an extended..guidi-ng portion and," the lowersection beingprf vvided with a stein extending Leyond the detaohahleConnection ot the eootione substantially through the' upper section andengaging the saine, a barrel ehdahle over the upper section and'guidedfby the saine and a holder y secured to thev lower Section.

tially through the upper section andl engaging,` the saine,-a barrelslidable'over the upper section andguided by the saine and a holder`Vconsisting of a huh seeuredto thelower end l of the lower section ofthe pistony and havingL laterally extending wingsl formingzgrips.-

7. An inverted hypoderinio syringeoom-v prieinga hollow tubular pistonhaving' an enlarged upper portion. or headeand ya reduced lowerportionor rod, the lower section provided with a stein extendinglsubstan iallythrough the upper Section anden- 'aging the san'ie, a barrel slidehleoverthe oetion and guided hy the saine, a `consistingv rol1 av hub:secured to the lower end ot the lower eocl'on oin the piston andhariilg laterally extending' wings forming grip-fs, and a guidelelidal'ile on the lower la he piston between the holder and 'the uppersection and provided with means ttor liorining a seat for the barrel andhaving yieldahle ineens for retaining the barrel `on the seat.

' An inverted hypoderinio syringe Coin-` prieing a hollow tubularlpiston provided at the lower ende with screw threads and having alongituf al here extending Centrally through thepiston, said.y pistonbeing also provided at its lower Lend witha proj eot'ing nippleVenlarged at the inner portion and grooved thereat tov receivea needleholding Spring, an' interiorly threaded `holder receiving the piston anddetaehably engaging the screw threads` thereof,r and a barreltelescopically Aiitted over and-guided by the piston.v`

In testimony whereof I have hereunto set my hand. n

GEORGE *.N. HEIN.

